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Your search keyword '"Dartois, E. [0000-0003-1197-7143]"' showing total 2 results
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2 results on '"Dartois, E. [0000-0003-1197-7143]"'

1. Spectroscopic sizing of interstellar icy grains with JWST

Author

Centre National de la Recherche Scientifique (France), Centre National D'Etudes Spatiales (France), Ministerio de Ciencia e Innovación (España), Dutch Research Council, Royal Astronomical Society, Space Telescope Science Institute (US), Swiss National Science Foundation, Ministry of Education (Taiwan), National Science and Technology Council (Taiwan), Danish National Research Foundation, European Commission, Dartois, E. [0000-0003-1197-7143], Noble, J. A. [0000-0003-4985-8254], Caselli, P. [0000-0003-1481-7911], Fraser, H. J. [0000-0003-0972-1595], Jiménez-Serra, I. [0000-0003-4493-8714], Maté, Belén [0000-0002-5478-8644], McClure, M. K. [0000-0003-1878-327X], #NODATA#, Pendleton, Y. J. [0000-0001-8102-2903], Sturm, J. A. [0000-0002-0377-1316], Taillard, A. [0009-0006-9236-7978], Wakelam, V. [0000-0001-9676-2605], Boogert, A. C.A. [0000-0001-9344-0096], Drozdovskaya, M. N. [0000-0001-7479-4948], Erkal, J. [0000-0002-8476-1389], Harsono, D. [0000-0001-6307-4195], Ioppolo, S. [0000-0002-2271-1781], Linnartz, H. [0000-0002-8322-3538], McGuire, B. A. [0000-0003-1254-4817], Perotti, G. [0000-0002-8545-6175], Rocha, W. R.M. [0000-0001-6144-4113], Dartois, E., Noble, J. A., Caselli, P., Fraser, H. J., Jiménez-Serra, I., Maté, Belén, McClure, M. K., Melnick, G. J., Pendleton, Y. J., Shimonishi, T., Smith, Z. L., Sturm, J. A., Taillard, A., Wakelam, V., Boogert, A. C.A., Drozdovskaya, M. N., Erkal, J., Harsono, D., Herrero, Víctor J., Ioppolo, S., Linnartz, H., McGuire, B. A., Perotti, G., Qasim, D., Rocha, W. R.M., Centre National de la Recherche Scientifique (France), Centre National D'Etudes Spatiales (France), Ministerio de Ciencia e Innovación (España), Dutch Research Council, Royal Astronomical Society, Space Telescope Science Institute (US), Swiss National Science Foundation, Ministry of Education (Taiwan), National Science and Technology Council (Taiwan), Danish National Research Foundation, European Commission, Dartois, E. [0000-0003-1197-7143], Noble, J. A. [0000-0003-4985-8254], Caselli, P. [0000-0003-1481-7911], Fraser, H. J. [0000-0003-0972-1595], Jiménez-Serra, I. [0000-0003-4493-8714], Maté, Belén [0000-0002-5478-8644], McClure, M. K. [0000-0003-1878-327X], #NODATA#, Pendleton, Y. J. [0000-0001-8102-2903], Sturm, J. A. [0000-0002-0377-1316], Taillard, A. [0009-0006-9236-7978], Wakelam, V. [0000-0001-9676-2605], Boogert, A. C.A. [0000-0001-9344-0096], Drozdovskaya, M. N. [0000-0001-7479-4948], Erkal, J. [0000-0002-8476-1389], Harsono, D. [0000-0001-6307-4195], Ioppolo, S. [0000-0002-2271-1781], Linnartz, H. [0000-0002-8322-3538], McGuire, B. A. [0000-0003-1254-4817], Perotti, G. [0000-0002-8545-6175], Rocha, W. R.M. [0000-0001-6144-4113], Dartois, E., Noble, J. A., Caselli, P., Fraser, H. J., Jiménez-Serra, I., Maté, Belén, McClure, M. K., Melnick, G. J., Pendleton, Y. J., Shimonishi, T., Smith, Z. L., Sturm, J. A., Taillard, A., Wakelam, V., Boogert, A. C.A., Drozdovskaya, M. N., Erkal, J., Harsono, D., Herrero, Víctor J., Ioppolo, S., Linnartz, H., McGuire, B. A., Perotti, G., Qasim, D., and Rocha, W. R.M.

Abstract

Clouds of gas and dust in the Galaxy are nurseries in which stars and planetary systems are born. During their journey from the diffuse interstellar medium to the protoplanetary disks, molecular solids accumulate on cold dust grains by accretion and surface chemistry. These so-called icy grains will continuously evolve, notably by collision and aggregation processes, modifying their sizes. Our ‘Ice Age’ James Webb Space Telescope observations of the dense Chamaeleon I cloud reveal that this growth starts early, before the protostellar phase, substantially modifying the ice band profiles in the spectra. Spectral analysis confirms that the grains reach micrometre sizes, implying myriad changes in local microphysics, including mass transfer from small to large grains, reduction in the grain surface available for chemistry and modification of the penetration and propagation of radiation fields. Deformation of the observed profiles complicates the determination of chemical abundance. Observing the extensive icy grain growth in dense clouds quantitatively constrains the grain size evolution before star and planet formation.

Published
2024

2. Photon-induced desorption of larger species in UV-irradiated methane ice

Author

H. Carrascosa, G. A. Cruz-Diaz, Y.-J. Chen, G. M. Muñoz Caro, Emmanuel Dartois, Carrascosa, H. [0000-0002-2885-4847], Chen, Y. J. [0000-0003-4497-3747], Dartois, E. [0000-0003-1197-7143], Ministerio de Ciencia e Innovación (MICINN), National Aeronautics and Space Administration (NASA), Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737, Agencia Estatal de Investigación (AEI), and Ministry of Science and Technology, Taiwan (MOST)

Subjects
Physics, Astrochemistry, Infrared, laboratory: molecular [Methods], Analytical chemistry, Infrared spectroscopy, Astronomy and Astrophysics, 010402 general chemistry, medicine.disease_cause, Mass spectrometry, 01 natural sciences, 0104 chemical sciences, Space and Planetary Science, Desorption, 0103 physical sciences, Quadrupole, medicine, Irradiation, ISM [Ultraviolet], 010303 astronomy & astrophysics, molecules [ISM], Ultraviolet
Abstract

At the low temperatures found in the interior of dense clouds and circumstellar regions, along with H2O and smaller amounts of species such as CO, CO2 or CH3OH, the infrared features of CH4 have been observed on icy dust grains. Ultraviolet (UV) photons induce different processes in ice mantles, affecting the molecular abundances detected in the gas phase. This work aims to understand the processes that occur in a pure CH4 ice mantle subjected to UV irradiation.We studied photon-induced processes for the different photoproducts arising in the ice upon UV irradiation. Experiments were carried out in ISAC, an ultra-high vacuum chamber equipped with a cryostat and an F-type UV lamp reproducing the secondary UV field induced by cosmic rays in dense clouds. Infrared spectroscopy and quadrupolemass spectrometry were used to monitor the solid and gas phases, respectively, during the formation, irradiation and warming-up of the ice. Direct photodesorption of pure CH4 was not observed. UV photons form CHx· and H· radicals, leading to photoproducts such as H2, C2H2, C2H6 and C3H8. Evidence for the photodesorption of C2H2 and photochemidesorption of C2H6 and C3H8 was found; the latter species is so far the largest molecule found to photochemidesorb. 13CH4 experiments were also carried out to confirm the reliability of these results., With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (MDM-2017-0737)

Published
2020
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